Itch has grown and infos are outdated. They obviously have some system that puts new stuff on a queue to be reviewed and other stuff directly to index.
There is speculation that certain actions will always trigger an inspection or put you back into queue.
And we should mind this: we do not know all the items that do not appear on index, since we do not see them. We do not see all the crap that does rightfully get cought and dealt with by staff. Think about this: there are about a million projects on itch. But they have a counter for projects that is over 2.5 million. This means, that over half again the current projects were either deleted or rejected - automatically or by staff or by the developer.
https://itch.io/docs/creators/quality-guidelines
There is inprecise, even contradictory information on that page regarding indexing. But it also is only a guideline, so maybe take it with a grain of salt.